Phosphorus removal under anoxic conditions in a continuous-flow A2N two-sludge process

Wang, Y.Y.; Peng, Yongzhen; Li, T.W.; Ozaki, Masuo; Takigawa, Akio; Wang, S.Y.

doi:10.2166/wst.2004.0357

Cited by 25 publications

(7 citation statements)

References 5 publications

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“…The concept of biological phosphorus removal under anoxic conditions in municipal wastewater treatment, coupled by a fixed film nitrification which provided the nitrate for the anoxic zone, was applied by Bortone et al (1996), introducing for the first time the so-called "DEPHANOX" process. Other researchers based their investigation on this pattern (Hu et al 2003;Wang et al 2004a;Torrico et al 2008). Sludge recirculation also occurs for the nitrifying sludge (sludge II) from ST2 back to the nitrification tank.…”

Section: Competition For Organic Substrate Between Ordinarymentioning

confidence: 99%

Comparison between UCT type and DPAO biomass phosphorus removal efficiency under aerobic and anoxic conditions

Kapagiannidis

Zafiriadis

Aivasidis

2009

Water Science and Technology

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Two different types of biomass, capable for Enhanced Biological Phosphorus Removal (EBPR), a UCT (University of Cape Town) type and a sludge enriched with DPAOs (Denitrifying Phosphorus Accumulating Organisms) were tested in batch reactors under specific operational and environmental conditions, in order to achieve a direct comparison of their phosphorus removal capability. Three types of batch reactors were operated, Anaerobic/Oxic (AO), Anaerobic/Anoxic (A2) and Anaerobic/Anoxic/Oxic (A2O), under controlled temperature and pH conditions. Maximum anaerobic specific phosphate release, substrate utilization, as well as denitrification and phosphate uptake rates under aerobic and anoxic conditions were determined and compared for the two different microbial populations. Experimental results indicated no significant difference between the anoxic and the aerobic phosphorus (P) uptake rates, respectively for DPAO and UCT sludge. The UCT sludge was also found to achieve anoxic P uptake, however to much less extend compared to the DPAO sludge. It has also been proved that anoxic P uptake seems to negatively affect the total P removal efficiency of this type of sludge, even under following aerobic conditions. Based on these findings, denitrifying phosphorus removal systems are proved comparable to conventional EBPR configurations (UCT), concerning phosphorus removal efficiency, while their operation is accompanied by potential advantages.

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Section: Competition For Organic Substrate Between Ordinarymentioning

confidence: 99%

Comparison between UCT type and DPAO biomass phosphorus removal efficiency under aerobic and anoxic conditions

Kapagiannidis

Zafiriadis

Aivasidis

2009

Water Science and Technology

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“…After 30 minutes, with the reduction in the concentration of nitrate, the removal rate of denitrification phosphorus declined simultaneously. This two-sludge system could provide a favorable environment for DPAOs, and the more phosphorus is absorbed in the anoxic zone, the less aerobic volume is required, which is more in line with the characteristics of this system [17][18][19][20].…”

Section: Phosphorus Uptake Batch Testmentioning

confidence: 67%

Advanced nitrogen and phosphorus removal in A2O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater

Wang

Peng

Chen

2011

Front. Environ. Sci. Eng. China

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A laboratory-scale anaerobic-anoxic-aerobic process (A 2 O) with a small aerobic zone and a bigger anoxic zone and biologic aerated filter (A 2 O-BAF) system was operated to treat low carbon-to-nitrogen ratio domestic wastewater. The A 2 O process was employed mainly for organic matter and phosphorus removal, and for denitrification. The BAF was only used for nitrification which coupled with a settling tank Compared with a conventional A 2 O process, the suspended activated sludge in this A 2 O-BAF process contained small quantities of nitrifier, but nitrification overwhelmingly conducted in BAF. So the system successfully avoided the contradiction in sludge retention time (SRT) between nitrifying bacteria and phosphorus accumulating organisms (PAOs). Denitrifying phosphorus accumulating organisms (DPAOs) played an important role in removing up to 91% of phosphorus along with nitrogen, which indicated that the suspended activated sludge process presented a good denitrifying phosphorus removal performance. The average removal efficiency of chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), and NH þ 4 -N were 85.56%, 92.07%, 81.24% and 98.7% respectively. The effluent quality consistently satisfied the national first level A effluent discharge standard of China. The average sludge volume index (SVI) was 85.4 mL$g -1 additionally, the volume ratio of anaerobic, anoxic and aerobic zone in A 2 O process was also investigated, and the results demonstrated that the optimum value was 1∶6∶2.

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“…A 2 N process had been proved as an energy-saving and cost-reducing process, which could save on aeration by 30% and carbon source by 50%, and also minimize the waste sludge. Although a great number of experimental studies on A 2 N process were carried out in benchscale with synthetic influent wastewaters [10,11], there were only several studies conducted with real domestic wastewater [12][13][14]. It was reported that DPAO biomass could be characterized with classical or molecular approaches; however, the comprehensive understanding of the denitrifying phosphorus removal system, including the optimal carbon source [5,15,16] and identification of dominant phosphorus removal organisms [17][18][19] was still unclear.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Denitrifying phosphorus removal for simultaneous nitrogen and phosphorus removal from wastewater with low C/N ratios and microbial community structure analysis

Sun

et al. 2016

Desalination and Water Treatment

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2014): Denitrifying phosphorus removal for simultaneous nitrogen and phosphorus removal from wastewater with low C/N ratios and microbial community structure analysis, Desalination and Water Treatment, A B S T R A C TSimultaneous nitrogen and phosphorus removal by denitrifying phosphorus accumulating organisms (DPAO) from domestic wastewater with a low C/N was studied in a pilot-scale A 2 N/BAF process. Through long-term investigation for more than 820 d, it was evidenced that the A 2 N/BAF performed well on COD, NH þ 4 -N and TP removals with efficiencies averaged at 84, 97 and 90%, respectively. Phosphorus removal in the system was mainly attributed to the function of DPAO through the analysis of phosphorus uptake and nitrate consumption, and the relative phosphorus uptake activity of DPAO/PAO was approximately 70.3%. Moreover, the microbial diversity and dominant bacterial community in the A 2 N/BAF was investigated with high-throughput sequencing. It was revealed that the A 2 N/BAF sludge had comparatively less diversity than seed sludge and shared several common dominant taxonomic bacteria with seed sludge, while long-term operation also shifted the microbial community. The A 2 N/BAF system was feasible for the treatment of low C/N wastewaters without any additional carbon source, which gave a new insight for efficient removal of organic and nutrients simultaneously.

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Phosphorus removal under anoxic conditions in a continuous-flow A2N two-sludge process

Cited by 25 publications

References 5 publications

Comparison between UCT type and DPAO biomass phosphorus removal efficiency under aerobic and anoxic conditions

Comparison between UCT type and DPAO biomass phosphorus removal efficiency under aerobic and anoxic conditions

Advanced nitrogen and phosphorus removal in A2O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater

Denitrifying phosphorus removal for simultaneous nitrogen and phosphorus removal from wastewater with low C/N ratios and microbial community structure analysis

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